Shaker conveyer



July'ifi, 1946. L. D. HAGENBOOK 2,404,058

SHAKER GONVEYER Fil-ed Nov. 16,- 1944 5 Sheets-Sheet l ATTORNEY -v 1.: D. HAGENBOOK 2,404,058

SHAKER CONVEYER Filed Nov. 16, 1944 3 Sheets-Sheet 2 3 Sheets-Sheet 3 SHAKER CONVEYER L. D. HAGENBOOK Filed NOV. 16, 1944 July 16, 1946.

22 HHIHIIHL.

Patented July 16, 1946 SHAKER CONVEYER Loy D. Hagenbook, Chicago, 111., assignor to Goodman Manufacturing Company, Chicago, 111., a corporation of Illinois Application November 16, 1944, Serial No. 563,633

23 Claims. 1

This invention relates to improvements in feeding mechanisms for shaker conveyers and has as its principal objects to provide a new and improved feeder head for shaker conveyers of the friction grip type, including a novel form of hydraulic operating and control means therefor so as to provide a uniform gripping action on each side of the extensible trough of the conveyer, to eliminate binding between the troughs heretofore caused by an uneven gripping,

action and to provide a more positive and efficient feeding means than formerly.

In carrying out my invention I mount a pair of friction grip blocks on each side of an extensible trough of a shaper conveyer and reciprocably drive these grip blocks by a reciprocating trough of the conveyer, and provide a fluid pressure cylinder and piston for each pair of grip blocks for positively engaging the grip blocks with the extensible trough during alternate strokes of the conveyer, to extensibly or retractibly move the extensible trough with respect to the reciprocating trough.

I also provide a fluid pump operated by reci-procable movement of the conveyer and provide a booster means operable by reaction of the extensible trough against the ground, to boost the pressure provided by the pump to re-, duce the required capacity of the pump used for supplying pressure to the system, together with a control valve operated by reciprocable movement of the conveyer, for supplying fluid under pressure to said fluid pressure cylinders and pistons, to move the grip blocks to a gripthat shown in Figure 2; showing the pump for effecting fluid pressure in the system in longitudinal section;

Figure 4 is an enlarged partial fragmentary transverse sectional View showing certain details of the pump for effecting fluid pressure in the system, which are not shown in Figure 3;

Figure 5 is a partial fragmentary View of the feeder head in side elevation with certain parts broken away and certain other parts thereof shown in substantially longitudinal section;

Figure 6 is a transverse sectional View taken substantially along line 6-6 of Figure 1;

Figure 7 is a longitudinal sectional view taken through the valve for supplying fluid under pressure to operate the grip blocks, showing certain details of said valve and the operating means therefor;

Figure 8 is an enlarged detail partial fragmentary transverse sectional View showing certain details of the friction gripping means for operating the control valve shown in Figure 7;

Figure 9 is a transverse sectional view taken substantially along line 99 of Figure 7;

Figure 10 is a transverse sectional View taken substantially along line I0l0 of Figure '7, but showing the means for operating the valve in a dilferent'operative position than in Figure 9;

Figure 11 is a fragmentary horizontal sectional view taken substantially along line Il-ll of Figure 5, and showing certain details of the booster cylinder and piston for boosting the pressure of the fluid used to apply the grip blocks, and for releasing pressure from said grip blocks ping position during alternate strokes of the upon overload;

conveyer, and operated by control levers which Figure 12 is a longitudinal sectional view taken are stationary during reciprocable movement of through the booster cylinder and piston shown the conveyer. in Figure 11 but showing the booster cylinder These and other objects of my invention will in a released position; and appear from time to time as the following Figure 13 is a diagrammatic View showing the specification proceeds and with reference to the fluid diagram for operating the feeding accompanying drawings wherein: mechanism.

Figure 1 is a fragmentary plan view of a feed- In the drawings, the main elements of my iner head constructed in accordance with my invention illustrated include a reciprocating trough vention, shown as being connected between the I0 having an extensible trough H mounted for reciprocating and extensible troughs of a extensible or retractible movement with respect shaker conveyer, with certain parts of the feeder thereto. Said extensible trough has a flared head broken away and certain other parts shown gathering shovel I2 at its forward end, and said in horizontal section; reciprocating trough is connected to the inby end Figure 2 is a fragmentary view in side elevaof a shaker conveyer trough line through a tion of the feeder head shown in Figure 1, with swivel (not shown) to permit lateral movement certain parts thereof shown in substantially of said reciprocating and extensible troughs to longitudinal section; enable said shovel to pick up material from the Figure 3 is a fragmentary view in side elevafar corners of a working place, as is clearly illustion of the opposite side of the feeder head from trated and described in Patent No. 2,360,169,

3 which issued to W. W. Sloane October 10, 1944. A frame l3, connected at its rear end to the swivel, extends along opposite sides of the reciprocating and extensible troughs for moving said troughs laterally about their swivel upon lateral movement of said frame. Said frame and its connection to said swivel is clearly shown in the aforementioned Patent No. 2,360,169, so will not herein be shown or described except to point out that it includes a pair of independent tubular arms M, M extending along each side of the reciprocating trough 10. Each of said arms is supported adjacent its forward end between a pair of vertically laterally spaced rollers l5, l5. Said rollers have convex engaging surfaces adapted to engage opposite sides of one of said arms. Said rollers are mounted between the furcations of a bifurcated supporting bracket l6 on vertical pins H, H. Said support bracket is herein shown as being transversely pivoted to and projecting outwardly from the forward end of a frame I9, on a transverse shaft 20. Said frame is secured to and extends across the bottom of and upwardly along opposite sides of said reciprocating trough and extends forwardly of the forward end thereof. The forward ends of said independent arms are provided with sheaves 2|, 2| about which flexible cables (not shown) are adapted to be trained, for feeding the reciprocating and extensible troughs laterally upon the application of power to either of said cables, when said cables are connected to fixed abutments remote from said arms, as is clearly shown and described in the aforementioned Sloane Patent No. 2,360,169.

The extensible trough II has a pair of bearing plates 22, 22 extending along its upper outer sides and secured to and projecting laterally from said sides. Said bearing plates also have the forward end of the reciprocating trough slidably supported thereon and extend between spaced rollers 23, 23 mounted in upwardly extending rear-' wardly disposed brackets 24, '24 of carrier members 25, 25.

The carrier members 25, 25 are pivotally connected toopposite sides of the frame l9 by means of links 26, 26'. Each of said links is pivotally connected to one side of said frame adjacent its lower end by means of a pivotal pin 21, and is pivotally connected to its associated carrier member adjacent its upper end by means of a pivotal pin 29. (See Figure 5.)

The links 26, 26 are held in a substantially upright position to reciprocably move the carrier members 25, 25, with the reciprocating trough Ill, upon reciprocable movement of said trough, by means of piston rods 30, 3B. Said piston rods are pivotally connected to said links intermediate the ends of said links by means of pivotal pins 3!, 3|, and are extensible from booster cylinders 33, 33 which are disposed rearwardly of said links, and are pivotally connected adjacent their rear ends to the frame I9 by means of pivotal pins 34, 34. Said last mentioned pivotal pins extend through spaced connecting ears 35, 35, extending rearwardly from said cylinders and interleaving a connecting lug 350 extending forwardly from a laterally extending upright wall 36 of said frame l9. A piston 31 movable within said booster cylinder is connected to the inner end of said piston rod, and springs 39 and 40 are interposed between opposite ends of said pistons and opposite end walls of said cylinder, to move said piston to a centered position in said cylinder. Said springs are each relatively heavy and tend to move said piston into a centered position when fluid pressure is relieved from said cylinder. The function of said booster cylinders, besides causing its associated carrier member 25 to reciprocably move with the reciprocating trough I0, is to supply fluid pressure to operate the feeding mechanism in addition to that obtained by the pump of the fluid pressure system, to enable a small and compact pump and accumulator to be used. This added pressure is obtained by the reaction of the shovel l2 and extensible trough ll against the ground, as will hereinafter more clearly appear as this specification proceeds.

The feeding mechanism includes the carrier members 25, 25, each of which carrier members is provided with an upper grip block 43, adapted to be engaged with the upper side of the bearing plate 22 by means of a lower grip block 44, which is adapted to engage the underside of said hearing plate. Said lower grip block is slidably mounted in a guide 4!, formed in said carrier member, and has a concave lower socket portion 42 pivotally mounted on the convex upper end of a piston rod 45. Said piston rod is extensible from a cylinder 46 and extends upwardly from a piston 4'! movable within said cylinder.

The upper grip block 43 is slidably mounted in a vertically extending guide 49 formed in an upwardly projecting portion 50 of the carrier member 25. An adjusting screw 5|, threaded in the upper end of said upwardly projecting portion, is provided to engage the upper side of said upper grip block and form an adjusting means therefor.

The cylinders 46, 45 are herein shown as being mounted in the lower portion of said carrier member and as having fluid passageways 51, 5! extending to their head ends, for the admission of fluid under pressure, to cause movement of the piston 41 in a direction to positively engage the grip blocks 44, 44 with the underside of the bearing plates 22, 22. A passageway 59 leads to the piston rod end of said cylinder, to admit fluid to positively release said lower grip block from the underside of said bearing plate. (See Figure 5).

Fluid under pressure, such as oil, is supplied to the fluid system by means of a fluid pump 66 operated by reciprocable movement of the conveyer. Said pump is herein shown as being a well known form of piston pump including an upright cylinder 6| mounted on the right-hand side of the frame l9, adjacent the rear end thereof, by means of a bracket 62' which is formed integrally with said cylinder. A piston 63 slidably mounted in said cylinder has a piston rod 64 depending therefrom. A roller 65 is mounted on the lower end of said piston rod between the furcations of a bifurcated lower end thereof, on a transversely extending pivotal pin 66. Said roller is adapted to ride along and engage the upper side of a longitudinally extending cam 61, mounted on the right-handarm M of the frame I3, on the inner ends of brackets 59, 69 secured to the inner side of said arm and extending inwardly therefrom. The surface of said cam is a sloping curve which slopes uniformly upwardly from its opposite ends to a relatively flat curved peak at its center. Said cam being stationary during reciprocation of the conveyer, relative movement between said cylinder and cam will cause the piston 63 to rectilinearly move within the cylinder GI and supply pressure to the fluid system.

An inlet passageway 10 having a check valve II therein is provided in the block of the cylinder ill, to admit fluid to said cylinder, while an outlet passageway 72 having a check valve 13 therein is provided for the release of fluid under pressure from said cylinder. A fluid pressure line I5 connects said outlet passageway with the pressure side of an accumulator It, for building up pressure therein. A suction line I6 connects the inlet passageway Ill with the low pressure side of said accumulator. Said low pressure side of said accumulator serves as a fluid storage tank for the iluid system. Said accumulator may be of any well known form and is herein diagrammatically shown as being a well known form of spring type accumulator, but is not herein shown or described in detail since it is no part of my present invention. Said accumulator is shown in Figure 3 as being mounted on the frame I9 beneath the pump 60 and extending to the rear of said frame.

A control valve I9 is provided to control the admission and release of fluid to and from the head and piston. rod ends of the cylinders '35, 45, and

is connected with the pressure side of the pump E i and the high pressure side of the accumulator I l by means of a pipe 80. A check valve El provided in said pipe to prevent the backing up of fluid pressure into said accumulator upon operation of the booster cylinder 33. A return pipe 82 connects the return side of said valve with the low pressure or tank side of said accumulator.

The control valve I9 may be a well known form of closed center 4-way piston valve having a pressure passageway 83 therein connected with the head ends of the cylinders 45, 45 by means of a pressure line M, for supplying fluid under pres" sure to said cylinders, to move the grip blocks MI, 44 into a position to engage the bearing plates 22, 22 with the undereides of the grip blocks 43, 63. Said valve also has a passageway 85 therein, which is connected with the piston rod ends of the cylinders 46, 4 5 by means of a pipe 85, to supply fluid under pressure to said piston rod ends of said cylinders, to move the grip blocks M, i l to a released position. Two spaced spools El and 38 formed integrally with a valve stem 89 are slidaoly movable in the chamber of said valve, to admit fluid under pressure from the pipe 89 to either of the pressure passageways 83 or 85, or to release fluid from either of said passageways to the low pressure side of the accumulator M through the pipe 82.

The stem. 89 of the valve spools 8'! and 88 extends outwardly in opposite directions from said valve spools, beyond the outer ends of the block of said valve. An eye 8% is formed on the lefthand end of said valve stem. Said eye is pivotally connected to an operating lever arm Bil, intermediate the ends of said lever arm, by means of a pivotal pin Ill. Said lever arm is pivotally connected at its lower end to a link 54. Said link extends from said lever arm towards the block of the valve IS, and is pivotally connected at its end opposite from said lever arm to an ear 95 depending from the lower side of the block of said valve. A lug 96 projects upwardly from the block of said valve and has a spring 9'! connected thereto at one of its ends, and connected to the lever 99 at its opposite end. Rocking movement of the lever 88 will thus move the spools 81 and 83 back and forth in the block of said control valve, and the spring 9! will tend to move said piston to a neutral position.

The right-hand end of the valve stem 89 has an eye 89I formed on its outer end, which is pivotally connected to the lower end of a lever arm I30 by means of a pivotal pin IIlI. A link I83 is pivotally connected to said lever arm intermediate its ends, and extends inwardly towards the block of said valve. Said link is pivotally connected to a lug IIl l extending upwardly from the block of said valve.

Thus, the pivotal axes of the lever arms and III!) are on opposite sides of the valve stem 89, so that when the lever Gil is pivoted in a direction which in Figure 7 is towards the right, the valve spools 8? and 88 will be moved towards the right, and when the lever arm Iilll is pivoted in the same direction, the valve spools 8'! and 88 will be moved towards the left.

An operating bar I65, held from reciprocable movement, is provided to operate either of the lever arms 96 or IIIEI. Said operating bar extends through an apertured. portion I E6 of the lever arm 90 and through an apertured portion Iii? of the lever arm Hill. A friction engaging connection is provided between said lever arms and said operating bar, to cause operation of said lever arms and valve by relative movement between said valve and operating bar. (See Figures 8, 9 and 10). Said engaging connection includes two aligned leaf springs I98, I08, secured to the rear face of the lever arm 99 and curved inwardly to extend inwardly along the apertured portion Ill of said lever arm. Said leaf springs are herein shown as being intersected at their center by a radial line spaced 45 in a clockwise direction from the vertical center of said lever arm. In a like manner, two aligned leaf springs IE9, Hi8 are secured to the right-hand, or rear, face of the lever arm I90 and extend inwardly along the apertured portion It? thereof. Said leaf springs are intersected at their center a radial line, disposed 45 from the Vertical axis of the lever arm I89 in a counterclockwise direction. Thus, when the bar IE5 is pivoted 45 in a clockwise direction, the springs see, I538 will engage opposite sides of said bar, to reciprocably move the lever arm 9d by relative movement between the valve 19 and said operating bar. Pivotal movement of said bar I25 45 in a counterclockwise direction, will cause the springs I69, I09 to engage opposite sides of said bar to reciprocably move the lever arm IIIG about its axis of connection to the link I533 by relative movement between said valve and operating bar, and will operate said valve in opposite phase relation from the lever arm 98.

The operating bar I is pivctally moved by means of a control handle lli secured to the outer end of a shaft III formed integrally with and extending forwardly of the forward end of said bar. Said shaft is pivotally mounted in a boss I I2 formed on the upper end of a bracket II 3 extending inwardly and upwardly from the arm I lof the frame I3. A lever arm I I l extends downwardly from said shaft and is connected to a similar lever arm on the opposite side of the frame I3 from the operating handle Ill}, by means of a tran versely extending link 6 I5. Said lever arm on the right-hand side of the machine is mounted in a bracket IIE extending inwardly and upwardly from the right-hand arm M, and is provided with an upright operating handle II'I, to permit operation of the operating bar I55 and the control valve I9 from either side of the frame I3.

Thus, when the operating handle H6 is moved 45 in a clockwise direction to position A shown in Figure 9, relative movement between said valve and bar'will cause the valve spools Ill and 33 to move back and forth within the chamber of said valve, to admit fluid under pressure through the passageway 83 and pressure line 84 to the head ends of the cylinders 46, 46 and to release fluid from the piston rod ends of said cylinders through the pipe 36, passageway 35 and return line 82, during the forward strokes of the conveyer. This will engage the grip blocks 44, 44 with the undersides of the bearing plates 22, 22 during the forward strokes of the conveyer. During the return strokes of the conveyer, said valve piston will be moved to admit fluid under pressure through the passageway 85 and pipe 86 to the piston rod ends of said cylinders, and to release fluid from the head ends of said cylinders, to disengage said grip blocks from said bearing plates. This will extensibly move said extensible trough with respect to said reciprocating trough.

When the control lever II!) is moved 45 in a counterclockwise direction to position B shown in Figure 10, relative movement between said valve and operating bar will cause reciprocable movement of the valve stem 89 and valve spools 81 and 38, 'to admit fluid under pressure to the head ends ofthe cylinders 43, 43 and to release fluid from the piston rod ends of said cylinders during the return strokes of the conveyer, and to admit fluid under pressure to the piston rod ends of said cylinders and to release it from the head ends of said cylinders during the forward strokes of the conveyer, to retractibly move said extensible trough with respect to said reciprocating trough.

Referring now to Figures 11 and 12 illustrating the booster cylinder 33, when the grip blocks 44, 44 hold the bearing members 22 in engagement with the grip blocks 43, 43, frictional resistance of the extensible trough II and the shovel I2 against the ground will tend to move the pistons 31, 31 towards the head ends of said cylinders. Said cylinders are filled with a hydraulic fluid, such as oil, at all times so that movement of said pistons towards the head ends of said cylinders will build up the pressure of the fluid therein until a predetermined pressure is reached, when fluid under pressure will be released through the pipe 84 to the head ends of the cylinders 46, 46. Fluid under pressure is released from each of said booster cylinders to said cylinders 46, 43 through a passageway II8 formed in the block of said booster cylinder, a check valve H9, and a passageway I2I connected with said pipe 84. This will increase the pressure in said cylinders 43, 46 over that supplied by the accumulator 14, to give a positive gripping action to said grip blocks, without necessitating the use of a high capacity pump and accumulator. Said check valve I I9 is of a well known ball type of check valve, the spring of which is of sufficient strength to hold pressure in said booster cylinder until the desired predetermined pressure is reached therein.

During the return strokes of the conveyer, frictional resistance of the extensible trough II and shovel I2 against the ground will cause movement of the pistons 31, 31 towards the piston rod ends of the cylinders 33, 33. This will build up pressure within thepiston rod ends of said cylinders until a predetermined pressure is reached when fluid under pressure will be released from each of said cylinders through a passageway I22, check valve I23, and passageway I24 connected with the passageway I2I, and to the pressure line 84 and head ends of the cylinders 46, 46, to boost the pressure supplied thereto by the accumulator 14.

During the return strokes of the conveyer, the supply of fluid in the head ends of the cylinders 33, 33 is replenished by suction developed by movement of the pistons 31, 31 towards the piston rod ends of said cylinders. During such movement of said pistons the suction created in the head ends of said cylinders draws fluid from the low pressure side of the accumulator 14 through pipes I25 and I26 connected with the block of said valve and through a passageway I21 in the block of said valve leading to the head end of said cylinder. A check valve I28 is provided in said passageway to prevent fluid under pressure from being discharged through said passageway.

Fluid is replenished in the piston rod ends of said cylinders by suction developed in said ends of said cylinders by the pistons 31, 31 during the forward strokes of the conveyer. During these strokes of the conveyer, fluid is sucked into the piston rod ends of each cylinder 33 through a passageway I29 connected with the passageway 121 on the suction side of the check valve I28. A check valve I30 is provided in said passageway to prevent the discharge of fluid under pressure through said passageway.

When the grip blocks .44, 44 are disengaged from the bearing plates 22, 22, the springs 39 and 40 will move the associated piston 31 to a centered position with respect to its cylinder.

A sleeve valve is provided in the head end of each cylinder 33 to release pressure from the head end of the associated cylinder 46 when the shovel I2 engages a solid obstruction during the forward strokes of the conveyer. Said sleeve valve includes a hollow valve sleeve I32 slidably mounted in the head end of said cylinder and moved to a closed position by a compression spring I33 in a spring chamber I34, in alignment with said cylinder and valve sleeve. The end of said valve sleeve adjacent said piston is open to admit fluid therein, and the end of said sleeve opposite said piston is closed to permit fluid under pressure to move said sleeve to the right against the spring I33. Said right-hand end of said sleeve is herein shown as being flanged to form a seat for the left-hand end of the spring I33. Said valve sleeve is provided with cross drilled passageways I35, I35 near the right-hand end of said valve, to permit the release of fluid through the spring chamber I34. Said valve sleeve is also cross-drilled intermediate its ends at I36, to release fluid from the piston rod end of the cylinders 46, 46 upon overload thereof, through a passageway I31 connected with the passageway I2I.

When the shovel I2 engages a solid obstruction, fluid under pressure in the head end of the cylinder 33 will move the hollow valve sleeve I32 to the right a distance sufficient to release fluid to the low pressure side of the accumulator 14 through the cross-drilled passageways I35, 635, formed in said sleeve adjacent the right-hand end thereof. Fluid being released through said passageways will pass into the spring chamber his and out of said chamber through a passageway I39, past a check valve I40, through a passageway I4I connected with the passageway I21, and out said last named passageway to the low pressure side of said accumulator through the pipes I23 and I25. Fluid will also be released from the head ends of the cylinders 46, 45 through the pressure line 84, pressure passageways I2I. 12!, the passageways I31, I31, cross-drilled passageways I36, I36 in the valve sleeves I32, I32, through the insides of said valve sleeves and out 9 said sleeves through the cross-drilled passageways I35, I35, and to the return through the passageway I39, check valve I40, passageway MI, pasasgeway I21, to and through the pipes I26 and I25.

The spring of the check valve M is strong enough to hold pressure in the spring chamber I34 until the pressure therein is considerably greater than the pressure furnished by the accumulator M, to prevent the release of pressure through the sleeve valve at the pressures furnished by the accumulator, or at the pressures normally provided by the booster cylinder, to extend or retract the extensible trough.

It may be seen from the foregoing that a simple and efficient fluid pressure operated feeding means has been provided for extending the extensible trough of a shaker conveyer trough line and for feeding a shovel on the forward end of this trough into the loose material it is desired to load, and that this feeding device is so arranged that a relatively small pump operated by reciprocable movement of the conveyer, may be provided to supply pressure for the fluid system.

It may also be seen that the use of a small pump and accumulator is made possible by supplementing the pressures supplied by the pump by auxiliary booster cylinders operated by the reaction of the extensible trough against the ground, and that these booster cylinders besides boosting the pressure provided by the pump also serve to release the grip blocks when the shovel engages a solid obstruction during the forward strokes of the conveyer.

It may further be seen that with the feeder head just described the gripping pressure of the grip blocks is always equal, which prevents binding of said trough, and that the control levers for operating the feeding mechanism are nonreciprocating, so they may readily be operated, to cause extension or retraction of the extensible trough.

It may still further be seen that the valve for supplying fluid under pressure to engage the grip blocks with their bearing plates during alternate strokes of the conveyer, is operated by reciprocable movement of the conveyer and requires no manual effort to operate it aside from turning the control handle IIfi to the desired operative position.

While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction thereof and the arrangement of the various parts may be altered without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting my invention to the specific embodiment illustrated, excepting as it may be limited in the appended claims.

I claim as my invention:

1. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyer, fluid operated means for moving said grip blocks to a gripping position, and valve means operated by reciprocable movement of the conveyer for supplying fluid under pressure to said fluid operated means during alternate strokes of the conveyer.

2. In a feeding device for shaker conveyers, a.

reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyer, and fluidoperated means for moving said grip blocks to a gripping position during alternate strokes of the conveyer including a fluid cylinder and piston on each side of said trough, said cylinders each having operative connection with one of said grip blocks, a pump for supplying fluid under pressure to said cylinders, and valve means connected between said pump and cylinders and operated by reciprocable movement of the conveyer to supply fluid to said cylinders to move said grip blocks into a gripping position during alternate strokes of the conveyer.

3. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough including two friction grip blocks connected with one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyer, and fluid operated means for moving said blocks to a gripping position during alternate strokes of the conveyer including a fluid cylinder on each side of said trough, said cylinders each having a piston operatively connected with one of said gri'p blocks, a pump for supplying fluid under pressure to said cylinders, a valve connected between said pump and said cylinders for controlling the supply of fluid under pressure thereto, and means operated by reciprocable movement of the conveyer for operating said valve to supply fluid to said cylinders during alternate strokes of the conveyer, to move said grip blocks to a gripping position.

4. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyer for moving said extensible trough relative to said reciprocating trough including two carrier members, said carrier members being connected with one of said troughs on opposite sides thereof and having two friction grip blocks carried thereby and adapted to engage the other of said troughs during alternate strokes of the conveyer, a separate fluid cylinder mounted in each carrier member and having a piston operatively connected with one of said grip blocks carried by each carrier member, a pump for supplying fluid under pressure to said cylinders, a valve connected between said pump and opposite ends of said cylinders and operabl to supply fluid under pressure to opposite ends of said cylinders, and valve operating means operated by reciprocable movement of the conveyer for moving said valve topositions to alternately supply fluid under pressure to the head and piston rod ends of said cylinders during alternate strokes of the conveyer.

5 In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough by reciprocable movement of the conveyer including a carrier member connected with one of said troughs and having two" friction gripblocks carried thereby and adapted to engage the other of said troughs during alternate strokes of the conveyer, a fluid cylinder having a piston operatively connected with one of said grip blocks, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and opposite ends of said cylinder and operable to supply fluid under pressure to opposite sides of said cylinder, valve operating means operated by reciprocable movement of the conveyer for moving said valve to positions to alternately supply fluid under pressure to the head and piston rod ends of said cylinder during alternate strokes of the conveyer, and manual control means for said valve operating means for moving said valve operating means to a position to cause said valve to admit fluid to the head end of said cylinder during the forward strokes of the conveyer and to the opposite end of said cylinder during the return strokes of the conveyer, to cause movement of said extensible trough in one direction, and to a position to cause said valve to admit fluid to the head end of said cylinder during the return strokes of the conveyer and to the opposite end of said cylinder during the forward strokes of the conveyer, to cause movement of said extensible trough in an opposite direction.

6. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, a frame extending along said reciprocating trough and adapted to move said troughs laterally, said frame being non-reciprocable during reciprocable movement of said troughs, a carrier member connected with one of said troughs and having two friction grip blocks mounted therein and adapted to engage another of said troughs, and means for moving said grip blocks to a gripping position dur ing alternate strokes of the conveyer, to cause relative movement of said extensible trough with respect to said reciprocating trough including a fluid pump, a fluid cylinder and piston having operative connection with said grip blocks, a fluid va ve rec procably movable with said reciprocating trough and connected between said pump and cylinder to control the admission of fluid under pressure to said cylinder and piston, to move said grip blocks to a gripping position during alternate strokes of the conveyer, valve operating means on said frame for operating said valve during each stroke of the conveyer due to reciprocable movement of said valve with respect to said valve operating means, and a control handle for said valve operating means for positioning said valve operating means to operate said valve to supply fluid to said cylinder and piston to move said grip, blocks to an engaged position during the forward strokes of the conveyer and to a released position during the return strokesof the conveyer, to cause extensible movement of saidextensible trough, and for positioning said valve operating means into another position to operate said valve to supply fluid to said cylinder and piston to move said grip blocks to an engaged position during the return strokes of the conveyer, and to a released position during its forward strokes to cause retractible movement of said extensible trough.

7. In a feeding device for shaker conveyers, a

reciprocating trough, an extensible trough, a

frame extending along said reciprocating trough and adapted to move said troughs laterally, said frame being non-reciprocable during reciprocable movement of said troughs, carrier member pivotally connected with said reciprocating trough, two friction grip blocks mounted on said carrier member adapted to grip said extensible trough during certain strokes of the conveyer, a cylinder having a piston therein having operative connection with one of said grip blocks, for engaging said grip block with said extensible trough, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and cylinder for admitting fluid under pressure to one end of said cylinder during certain strokes f the conveyer and to the other end of said cylinder during the opposite strokes of the conveyer, and valve operating means on said frame for operating said valve during each forward and return stroke of the conveyer due to reciprocable movement of said valve with respect to said valve operating means,

8. In a feeding devicefor shaker conveyers, a reciprocating trough, an extensible trough, a frame extending along said reciprocating trough and adapted to move said reciprocating and extensible troughs laterally, said frame being nonreciprocable during reciprocable movement of said troughs, a carrier member connected with said reciprocating trough, two friction grip blocks mounted in said carrier member and adapted to grip said extensible trough above and below a portion thereof during certain strokes of the conveyer, a cylinder having a piston therein having operative connection with one of said grip blocks, for engaging said grip block with said extensible trough, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and cylinder for admitting fluid under pressure to one end of said cylinder during certain strokes of the conveyer and to the other end of said cylinder during the opposite strokes of the conveyer, valve operating means on said frame for operating said valve during each forward and return stroke of the conveyer due to reciprocable movement of said valve with respect to said valve operating means, and a control handle on said frame manually operable to move said valve operating means into position to operate said valve to supply fluid under pressure to one end of said cylinder to engage said grip blocks with said extensible trough, during the forward strokes of the conveyer, to cause extensible movement of said extensible trough, and to move said valve operatin means into position to operate said valve to supply fluid under pressure to the same end of said cylinder during the return strokes of the conveyer, to cause retractible movement of said extensible trough.

9. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, a frame extending along said reciprocating trough and adapted to move said troughs laterally, said frame being non-reciprocable during reciprocable movement of said troughs, a carrier member pivotally connected with said reciprocating trough, two friction grip blocks mounted on said carrier member and adapted to grip said extensible trough above and below a portion thereof during certain strokes of the conveyer, a cylinder having a piston therein having operative connection with one of said grip blocks, for engaging said grip block with said extensible trough, a pump for supplying fluid under pressure to said cylinder, an operative connection between said pump and said frame to operate said pump by relative movement between said reciprocating trough and said frame, a valve reciprocably movable with said reciprocating trough and connected between said pump and said cylinder, and means operated by relative movement between said reciprocating trough and frame for operating said valve to admit fluid under pressure to one end of said cylinder during certain strokes of the conveyer and to the opposite,

13 end of said cylinder during certain other strokes of the conveyer.

10. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, a frame extending along said reciprocating trough and adapted to move said troughs laterally, said frame being non-reciprocable during reciprocable movement of said troughs, a carrier member pivotally connected with said reciprocating trough, two friction grip blocks mounted on said carrier member and adapted to grip said extensible trough above and below a portion thereof during certain strokes of the conveyer, a cylinder having a piston therein having operative connection with one of saidgrip blocks, for engaging said grip block with said extensible trough, a pump for supplyingfluid under pressure to said cylinder, an operative connection between said pump and said frame to operate said pump by relative movement between said reciprocating trough and said frame, a valve reciprocably movable with said reciprocating trough and connected between said pump and said cylinder, and means operated by relative movement between said reciprocating trough and frame for operating said valve to admit fluid under pressure to one end of said cylinder during certain strokes of the conveyer and to the opposite end of said cylinder during certain other strokes of the conveyer, including a control handle on said frame and an operative connection between said control handle and said valve.

11. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, a frame extending along said reciprocating trough and adapted to move said troughs laterally, said frame being non-reciprocable during reciprocable movement of said troughs, a carrier member pivotally connected with said reciprocating trough, two friction grip blocks mounted on said carrier member and adapted to grip said extensible trough above and below a portion thereof during certain strokes of the conveyer, a cylinder having a piston therein having operative connection with one of said grip blocks,for engaging said grip block with said extensible trough, a pump for supplying fluid under pressure to said cylinder, an operative connection between said pump and said frame to operate said pump by relative movement between said reciprocating trough and said frame, a valve reciprocably movable with said reciprocating trough and connected between said pump and said cylinder, and means operated by relative movement between said reciprocating trough and frame for operating said valve to admit fluid under pressure to one end of said cylinder during certain strokes of the conveyer and to the opposite end of said cylinder during certain other strokes of the conveyer, including a lever arm having operative connection with said valve, a control handle on said frame, and an operative connection between said control handle and lever arm to cause oscillation of said lever arm upon turning of said control handle to an operative position.

12. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, a frame extending along said reciprocating trough and adapted to move said troughs laterally, said frame being non-reciprocable during reciprocable movement of said troughs, a carrier member pivotally connected 'with said reciprocatin trough, two friction grip blocks mounted on said carrier member and adapted "to grip said extensible trough above and below a portion 7 14 thereof during certain strokes of the conveyer, a cylinder having a piston therein having operative connection with one of said grip blocks, for engaging said grip block with said extensible trough, a pump for supplying fluid under pressure to said cylinder, an operative connection between said pump and said frame to operate said pump by relative movement between said reciprocating trough and said frame, a valve reciprocably movable with said reciprocating trough and connected between said pump and said cylinder, and means operated by relative movement between said reciprocating trough and frame for operating said valve to admit fluid under pressure to one end of said cylinders during the forward strokes of the conveyer to engage said grip blocks with said extensible trough and to the opposite end of said cylinder during the return strokes of the conveyer to disengage said grip blocks from said extensible trough, to cause extensible movement of said extensible trough, and for operating said valve to admit fluid under pressure to said one end of said cylinder to engage said grip blocks with said extensible trough during the return strokes of the conveyer and to said opposite and of said cylinder to disengage said grip blocks from said extensible trough during the forward strokes of the conveyer, to cause retractible movement of said extensible trough, including two oppositely acting lever arms having connection with said valve, a control handle on said frame and an operative connection between said control handle and said lever arms to cause oscillation of one of said lever arms due to reciprocable movement of the conveyer upon turning of said control handle to one operative position and to cause oscillation of the other of said lever arms due to reciprocable movement of the conveyer upon the-turning of said control handle to another operative position.

13. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyer, for moving said extensible trough relative to said reciprocating trough including a carrier member, two friction grip blocks carried by said carrier member, a fluid pressure cylinder and piston mounted on said carrier member for engaging said grip blocks with one of said troughs during certain strokes of the conveyer, and an operative connection between said carrier member and said other trough operated by frictional resistance between said extensible trough and the ground to supply fluid under pressure to said cylinder and piston,

to move said grip blocks to a gripping position including a longitudinally extending fluid pressure cylinder and piston pivotally connected between said carrier member and said other trough operated by frictional resistance between up therein due to the thrusts imparted thereto by the reaction of said extensible trough against the ground, a, fluid connection from said longitudinally extending cylinder to said first mentioned cylinder, and valve means connected between said longitudinally extending cylinder and said fluid connection for holding pressure in said longitudinally extending cylinder until it reaches a predetermined value, and then permitting fluid under pressure to pass through said fluid connection to said first mentioned cylinder.

14'. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough,

115 and means operated by reciprocable movement of the conveyer for moving said extensible trough relative to said reciprocating troughineluding a carrier member,v two friction grip blocks carried by said carrier. member, a fluid pressure cylinder and piston mounted on said carrier member for engaging said grip blocks with one of said troughs during certain strokes of the conveyer, and an operative connection between said carrier member and said other trough operated by frictional resistance between said extensible trough and the ground to supply fluid under pressure to said cylinder and piston in a direction to move said grip blocks to a gripping position including a longitudinally extending fluid pressure cylinder and piston pivotally connected between said carrier member and said other trough and adapted to have fluid pressure built up therein due to the thrust imparted thereto by the reaction of said extensible trough against the ground, a fluid connection from said longitudinally extending cylinder to said first mentioned cylinder, and valve means connected between said longitudinally extending cylinder and said fluid connection for holding pressure in said longitudinally extending cylinder until it reaches a [predetermined value, and then permitting fluid under pressure to pass through said fluid connection to said first mentioned cylinder, and other valve means in said last mentioned cylinder for releasing fluid pressure from said cylinders, to release said grip blocks when said extensible trough engages a solid obstruction, upon the forward strokes of the conveyer.

15. In a feeding device for shaker conveyors, a reciprocatingtrough, an extensible trough, and means operated by recipro-cable movement of the conveyer for moving said extensible trough relative to said reciprocating trough including a carrier member, two friction grip blocks carried by said carrier member, a fluid pressure cylinder and piston mounted on said carrier member for engaging said grip blocks with said extensible trough during alternate strokes of the conveyer, a longitudinally extending fluid pressure cylinder having a piston therein connecting said carrier member with said reciprocating trough, to cause said carrier member to reciprocably move with said reciprocating trough, a valve in said longitudinally extending cylinder to permit fluid pressure to be built up therein by movement of said associated piston along said longitudinally extending cylinder effected by the thrust imparted to said piston through said extensible trough by frictional resistance between said extensible trough and the ground, and fluid connections between said longitudinally extending cylinder and said first mentioned cylinder for supplying fluidunder pressure to said first mentioned cylinder upon release of said valve.

16. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyer for moving said extensible trough relative to said reciprocating trough including a carriermember, two friction grip blocks carried by said carrier member, a fluid pressure cylinder and piston mounted on said carrier member for engaging said grip blocks with said extensible trough during alternate strokes of the conveyer, a longitudinally extending fluid pressure cylinder having a piston therein, connecting said carrier member with said reciprocating trough, to cause said carrier member to reciprocably move with said reciprocating trough, a valve in said longitudinally extending cylinder to permit fluid pressure to be built up therein by movement 0 said associated piston along said longitudinally extending cylinder effected by the thrust imparted to said piston through said extensible trough by frictional resistance between said extensible trough and the ground, and fluid connections between said longitudinally extending cylinder and said first mentioned cylinder for supplying fluid under pressure to said first 1nentio-ned cylinder upon release of said valve, and other Valve means in said longitudinally extending cylinder for releasing fluid pressure from both of said cylinders, to release said grip blocks when said extensible trough engages a solid obstruction upon the forward strokes of the conveyer. 7

1'7. In a feeding device for shaker conveyers, a reciprocating trough an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocal-ting trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, and a booster cylinder and piston connecting said carrier member with said reciprocating trough for reciprocably moving said carrier member with said reciprocating trough, said booster cylinder having fluid therein and being operable to boost the gripping action of said grip blocks due to the thrust imparted to said piston by said extensible trough by the reaction of said extensible trough on the ground, and valve means adapted to release the pressure in said booster cylinder to the return to permit slippage of said grip blocks along said extensible trough when said extensible trough engages a solid obstruction on the ground.

18. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocating trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, and a booster cylinder and piston connecting said carrier member with said reciprocating trough for reciprocably moving said carrier member with said reciprocating trough, said booster cylinder being operable to boost the gripping action of said grip blocks due to the thrust imparted to said piston by said extensible trough by the reaction of said extensible trough on the ground.

19; In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocating trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, a fluid cylinder mounted on said carrier member having a piston movable therein, an operative connection between said piston and one of said grip blocks, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and cylinder for admitting fluid under pressure to said cylinder to engage said grip blocks with said extensible trough during alternate strokes of the conveyer, and means connecting said carrier member with said reciprocating trough for reciprocably moving said carrier member-With said reciprocating trough.

said means being operated by the thrust imparted to said carrier member by the reaction of said extensible trough on the ground, to boost the gripping action of said grip blocks, and also being operable to release fluid from said cylinder, to release said grip blocks when said extensible trough engages an obstruction on the ground.

20. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocating trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, a fluid cylinder mounted on said carrier memher having a piston movable therein, an operative connection between said piston and one of said grip blocks, a pump for supplying fluid under pressure to said cylinder, a valve connected be tween said pump and cylinder for admitting fluid under pressure to said cylinder to engage said grip blocks with said extensible trough during alternate strokes of the conveyer, and a booster cylinder and piston connecting said carrier memher with said reciprocating trough for reciprocably moving said carrier member with said reciprocating trough, said booster cylinder and piston having fluid connections with said first mentioned cylinder and being operated by the thrust imparted to said carrier member by the reaction of said extensible trough on the ground, to supply fluid pressure to said first mentioned cylinder in excess of that supplied by said pump, to boost the gripping action of said grip blocks.

21. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocating trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, a fluid cylinder mounted on said carrier member having a piston movable therein, an operative connection between said piston and one of said grip blocks for moving said grip blocks into a gripping position, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and cylinder for admitting fluid-under pressure to said cylinder to engage said grip blocks with said extensible trough during alternate strokes of the conveyer, and a booster cylinder and piston connecting said carrier member with said reciprocating trough for reciprocably moving said carrier member with said reciprocating trough, a fluid connection from said booster cylinder and piston to said first mentioned cylinder, operable to supply fluid pressure to said first mentioned cylinder which is built up in said booster cylinder by the thrust imparted to said piston therein due to the reaction of said extensible trough on the ground, and which built up pressure is in excess of that supplied by said pump, to boost the gripping action of said grip blocks, and valve means adapted to release the pressure in said booster cylinder to the return and to release pressure from said first mentioned cylinder and piston, to permit slippage of said grip blocks along said extensible trough when said extensible trough engages a solid obstruction on the ground.

22. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocating trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, a fluid cylinder mounted on said carrier member having a piston movable therein, an operative connection between said piston .and one of said grip blocks for moving said grip blocks into a gripping position, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and cylinder for admitting fluid under pressure to said cylinder to engage said grip blocks with said extensible trough during alternate strokes of the conveyer, and a booster cylinder and piston connecting said carrier member with said reciprocating trough for reciprocably moving said carrier member with said reciprocating trough, a fluid connection from said booster cylinder to said first mentioned cyl inder to supply fluid pressure built up in said booster cylinder by the thrust imparted to said piston in said booster cylinder caused by the reaction of said extensible trough against the ground, a valve for holding fluid under pressure in said booster cylinder until it reaches a predetermined value, and then releasing fluid under pressure through said fluid connection to said first mentioned cylinder, to supply fluid under pressure to said first mentioned cylinder in excess of that supplied by said pump, to boost the gripping action of said grip blocks.

23. In a feeding device for shaker conveyers, a reciprocating trough, an extensible trough mounted for extensible or retractible movement with respect to said reciprocating trough, a carrier member reciprocably driven by said reciprocating trough, two friction grip blocks on said carrier member adapted to grip said extensible trough during alternate strokes of the conveyer, a fluid cylinder mounted on said carrier member having a piston movable therein, an operative connection between said piston and one of said grip blocks for moving said grip blocks into a gripping position, a pump for supplying fluid under pressure to said cylinder, a valve connected between said pump and cylinder for admitting fluid under pressure to said cylinder to engage said grip blocks with said extensible trough during alternate strokes of the conveyer, a booster cylinder and piston connecting said carrier memher with said reciprocating trough for reciprocably moving said carrier member with said reciprocating trough, a fluid connection from said booster cylinder to said first mentioned cylinder to supply fluid pressure built up in said booster cylinder by the thrust imparted to said piston in saidbooster cylinder caused by the reaction of said extensible trough against the ground, a valve for holding fluid under pressure in said booster cylinder until it reaches a predetermined value, and then releasing fluid under pressure through said fluid connection to said first mentioned cylinder to supply fluid under pressure to said first mentioned cylinder, in excess of that supplied by said pump, to boost the gripping action of said grip blocks, and other valve means for releasing fluid from said booster cylinder and said first mentioned cylinder to the return, to release said grip blocks from said extensible trough when the forward end of said extensible trough engages a solid obstruction on the ground.

LOY D. HAGENBOOK, 

